Seahorse Data

[Kilix]

Hey guys, I'm posting here because I'm stumped and need some help. I've been trying to do some more scientific research on seahorse pregnancies lately and there's some information I just can't seem to find. If there's someone out there that knows, I figured this may be the place to ask. Does anyone know how big the average pregnant seahorse will grow? I know their sizes vary from species to species, but there seems to be absolutely no information I can find via traditional online means on size, weight, and other pregnancy-related statistics.

I'd also be happy to learn about similarly related species like pipefish or sea dragons if you can't find anything on seahorses. Thanks!